The 2500ft 120 Kias level-off (your words) occurred at about 15:45:23 with the a/c in Direct law
This is absolutely wrong: it was at 15:45:50 and in alternate law. At that point, the pitch had stopped dropping, wings were horizontal and IAS was 120 at 2500ft. You can even see fully forward stick (which is what Tyropicard probably designated as full up elevator) as the pitch started to increase because of the THS, untill the plane stalls again. At that time there was no unusual attitude, alternate law and full forward stick: in other words the auto trim should have shown a signe of movement. How do you explain that ? How can anybody say the crew didn't try to use manual trim?